1)9х+2y-4 =0
{
8x+y-2=0
2)5u+7v+3=0
{
10u-v+6=0

1) 9x+2(2-8x)=0 { y=2-8x9x+4-16x=0 { y=2-8x-7x=-4 { y=2-8xx=4/5 { y=2-8(4/5)x=4/5 { y=2-32/5x=4/5 { y=10/5 - 32/5x=4/5 { y= - 22/5x=4/5 { y= -4,42) 5u+7(6+10u)+3=0 { v=6+10u5u+42+70u+3=0 { v=6+10u75u=-45 { v=6+10uu=-0,6 { v=6+10×-0,6u=-0,5 { v=0